flatcc through 0.6.4 contains an integer overflow vulnerability in the check_header function of the FlatBuffers verifier because its overflow guard is dead code. On 32-bit builds, attackers can supply a crafted buffer offset that wraps the bounds check, causing an out-of-bounds read before the buffer and crashing the process.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00382.

Exploitation none

Automatable no

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
dvidelabs flatcc unaffected
Version Status Constraints
0 affected ≤ 0.6.4

No data.

No data.

OpenCVE Enrichment is a feature of OpenCVE that uses AI to automatically link vendors and products to CVEs. Learn more on GitHub.

Vendors Products
Dvidelabs Subscribe
Flatcc Subscribe
Flatcc Project Subscribe
Flatcc Subscribe

Project Subscriptions

Vendors Products
Dvidelabs Subscribe
Flatcc Subscribe
Flatcc Project Subscribe
Flatcc Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/dvidelabs/flatcc cve-icon cve-icon
https://github.com/dvidelabs/flatcc/blob/v0.6.4/src/runtime/verifier.c#L126-L137 cve-icon cve-icon
https://github.com/dvidelabs/flatcc/commit/0df9c097a19badc8bd22d93af8fd47bd291e5d9f cve-icon cve-icon
https://hackmd.io/@haindpwn/flatcc-json-number-oob-read cve-icon cve-icon
https://www.vulncheck.com/advisories/flatcc-through-0.6.4-out-of-bounds-read-via-verifier-check-header cve-icon cve-icon
History

Tue, 27 Oct 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Tue, 27 Oct 2026 07:45:00 +0000

Type Values Removed Values Added
First Time appeared Dvidelabs
Dvidelabs flatcc
Vendors & Products Dvidelabs
Dvidelabs flatcc

Tue, 27 Oct 2026 04:30:00 +0000

Type Values Removed Values Added
Description flatcc through 0.6.4 contains an integer overflow vulnerability in the check_header function of the FlatBuffers verifier because its overflow guard is dead code. On 32-bit builds, attackers can supply a crafted buffer offset that wraps the bounds check, causing an out-of-bounds read before the buffer and crashing the process.
Title flatcc through 0.6.4 Out-of-Bounds Read via verifier check_header
First Time appeared Flatcc Project
Flatcc Project flatcc
Weaknesses CWE-190
CPEs cpe:2.3:a:flatcc_project:flatcc:*:*:*:*:*:*:*:*
Vendors & Products Flatcc Project
Flatcc Project flatcc
References
Metrics cvssV3_1

{'score': 3.7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L'}

cvssV4_0

{'score': 6.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N'}

Projects

Sign in to view the affected projects.

cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-27T14:17:08.680Z

Reserved: 2026-10-26T20:23:35.552Z

Link: CVE-2026-116734

cve-icon Vulnrichment

Updated: 2026-10-27T13:42:03.497Z

cve-icon NVD

Status : Deferred

Published: 2026-10-26T22:16:57.527

Modified: 2026-10-27T15:16:46.750

Link: CVE-2026-116734

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-27T09:15:18Z

Weaknesses